XtreemFS is open-source (BSD license) and free of charge.
We provide pre-built packages for a range of Linux distributions through the openSUSE build service.
For Windows and Mac OS X we only provide pre-compiled client packages.
The XtreemFS Hadoop Client can be downloaded here. See the userguide for instructions how to enable it in your Hadoop setup.
Unstable Packages
To quickly respond to the needs of our users, we frequently publish unstable packages which fix known bugs and include features of upcoming versions. For regular announcements of new unstable packages, please follow our mailing list.